:root{--as-blue:#2563eb;--as-line:#e2e8f0;--as-muted:#64748b;--as-bg:#f6f8fc}
*{box-sizing:border-box}body{margin:0;background:var(--as-bg);color:#172033;font-family:"PingFang SC","Microsoft YaHei",sans-serif}.assignment-page{width:min(1180px,calc(100% - 40px));margin:0 auto;padding:28px 0 64px}.assignment-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:22px}.assignment-head h1{margin:0 0 5px;font-size:28px}.assignment-head p{margin:0;color:var(--as-muted)}.assignment-primary{border:0;border-radius:10px;background:var(--as-blue);color:#fff;padding:10px 17px;font:inherit;font-weight:750;cursor:pointer}.assignment-panel,.assignment-card{border:1px solid var(--as-line);border-radius:16px;background:#fff}.assignment-panel{padding:22px;margin-bottom:22px}.assignment-panel[hidden]{display:none}.assignment-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.assignment-field{display:grid;gap:7px}.assignment-field.full{grid-column:1/-1}.assignment-field label,.assignment-group-title{font-size:13px;font-weight:750;color:#334155}.assignment-field input{width:100%;border:1px solid #cbd5e1;border-radius:9px;padding:10px 12px;font:inherit}.assignment-pickers{display:grid;grid-template-columns:1.25fr .75fr;gap:16px;margin-top:18px}.assignment-picker{border:1px solid var(--as-line);border-radius:12px;overflow:hidden}.assignment-picker-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:11px 13px;background:#f8fafc;border-bottom:1px solid var(--as-line)}.assignment-picker-head input{min-width:0;border:1px solid #dbe3ee;border-radius:7px;padding:6px 8px}.assignment-check-list{max-height:310px;overflow:auto;padding:8px}.assignment-check{display:flex;align-items:flex-start;gap:9px;padding:9px;border-radius:8px;cursor:pointer}.assignment-check:hover{background:#f8fafc}.assignment-check input{margin-top:3px}.assignment-check strong{display:block;font-size:13px}.assignment-check small{display:block;margin-top:2px;color:var(--as-muted);font-size:11px}.assignment-form-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}.assignment-secondary{border:1px solid #cbd5e1;border-radius:9px;background:#fff;color:#475569;padding:9px 14px;font:inherit;cursor:pointer}.assignment-message{min-height:22px;margin-top:10px;color:#dc2626;font-size:13px}.assignment-list{display:grid;gap:14px}.assignment-card{padding:18px 20px}.assignment-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.assignment-card h2{margin:0 0 6px;font-size:19px}.assignment-card-meta{color:var(--as-muted);font-size:13px}.assignment-progress{height:8px;margin:15px 0 10px;overflow:hidden;border-radius:999px;background:#e5e7eb}.assignment-progress span{display:block;height:100%;border-radius:inherit;background:var(--as-blue)}.assignment-stats{display:flex;gap:16px;flex-wrap:wrap;color:#475569;font-size:12px}.assignment-stats b{color:#172033}.assignment-detail-table{width:100%;border-collapse:collapse}.assignment-detail-table th,.assignment-detail-table td{padding:12px 10px;border-bottom:1px solid #edf0f4;text-align:left;font-size:13px}.assignment-detail-table th{color:#64748b;background:#f8fafc}.assignment-status{display:inline-flex;border-radius:999px;padding:3px 9px;background:#f1f5f9;color:#64748b;font-size:12px;font-weight:700}.assignment-status.completed{background:#dcfce7;color:#15803d}.assignment-status.learning{background:#dbeafe;color:#1d4ed8}.assignment-status.overdue{background:#fee2e2;color:#b91c1c}.assignment-student-items{display:grid;gap:5px;margin-top:8px}.assignment-student-item{display:flex;justify-content:space-between;gap:12px;color:#64748b;font-size:12px}.assignment-empty{padding:48px;text-align:center;color:#94a3b8}.student-assignment-list{display:grid;gap:16px}.student-assignment-actions{display:flex;gap:9px;margin-top:14px}.student-assignment-items{display:grid;gap:8px;margin-top:16px}.student-assignment-item{display:flex;align-items:center;justify-content:space-between;gap:14px;border-top:1px solid #edf0f4;padding:12px 0}.student-assignment-item a{color:var(--as-blue);font-weight:700}.student-assignment-item.done strong{color:#15803d}.student-assignment-item small{color:var(--as-muted)}
@media(max-width:760px){.assignment-page{width:calc(100% - 24px);padding-top:18px}.assignment-head{align-items:flex-start;flex-direction:column}.assignment-form-grid,.assignment-pickers{grid-template-columns:1fr}.assignment-field.full{grid-column:auto}.assignment-card-top{flex-direction:column}.assignment-detail-table{display:block;overflow-x:auto}}